Abstract
The influence of tree height on the composition of bark extractives from Eucalyptus globulus and Eucalyptus nitens was investigated for its potential in the sourcing of valuable compounds. The bark of these trees was extracted at different heights to obtain lipophilic and hydrophilic compounds, which were chemically characterized. The extraction yield of lipophilic compounds was higher for E. globulus than for E. nitens. The type and proportion of the compounds changed with the tree variety and height. The main compounds detected were triterpenic acid derivatives, such as lupane, oleanane and ursane types, followed by fatty acids. The yield extraction of the hydrophilic compounds was higher for E. nitens than E. globulus. The total phenolic content, proanthocyanidins and antioxidant activity of the extracts increased with the tree height in both cases. However, the E. globulus extracts [half maximal inhibitory concentration (IC50) = 13.8 ± 0.2 μg ml−1] showed higher antioxidant activity than did the E. nitens extracts (IC50 = 22.8 ± 0.2 μg ml−1). Differences in the extract composition and the spatial conformation of the molecules (steric effect) could also help to obtain a higher antioxidant capacity from E. globulus extracts. These results show that differentiation by tree height can contribute to the selective enrichment of these valuable compounds.
Funding source: FONDEF
Award Identifier / Grant number: N° ID15I10100
Funding statement: The authors thank Project FONDEF, Funder Id: 10.13039/501100008736, N° ID15I10100 for the financial support of this research and the Comaco Forest Company for the donation of the tree.
Author contributions: All of the authors have accepted responsibility for the entire content of this submitted manuscript and approved its submission.
Employment or leadership: None declared.
Honorarium: None declared.
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©2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Original Articles
- Influence of tree height on the hydrophilic and lipophilic composition of bark extracts from Eucalyptus globulus and Eucalyptus nitens
- Modelling the viscoelastic mechanosorptive behaviour of Norway spruce under long-term compression perpendicular to the grain
- Frequency-dependent viscoelastic properties of Chinese fir (Cunninghamia lanceolata) under hygrothermal conditions. Part 1: moisture adsorption
- Frequency-dependent viscoelastic properties of Chinese fir (Cunninghamia lanceolata) under hygrothermal conditions. Part 2: moisture desorption
- Evolution of extractive composition in thermally modified Scots pine during artificial weathering
- Dynamic mechanical analysis (DMA) at room temperature of archaeological wood treated with various consolidants
- Visual and machine strength grading of European ash and maple for glulam application
- Evaluation of bond strength of cross-laminated LSL specimens under short-span bending
Articles in the same Issue
- Frontmatter
- Original Articles
- Influence of tree height on the hydrophilic and lipophilic composition of bark extracts from Eucalyptus globulus and Eucalyptus nitens
- Modelling the viscoelastic mechanosorptive behaviour of Norway spruce under long-term compression perpendicular to the grain
- Frequency-dependent viscoelastic properties of Chinese fir (Cunninghamia lanceolata) under hygrothermal conditions. Part 1: moisture adsorption
- Frequency-dependent viscoelastic properties of Chinese fir (Cunninghamia lanceolata) under hygrothermal conditions. Part 2: moisture desorption
- Evolution of extractive composition in thermally modified Scots pine during artificial weathering
- Dynamic mechanical analysis (DMA) at room temperature of archaeological wood treated with various consolidants
- Visual and machine strength grading of European ash and maple for glulam application
- Evaluation of bond strength of cross-laminated LSL specimens under short-span bending